215530164 has 36 divisors (see below), whose sum is σ = 552282276. Its totient is φ = 70858368.

The previous prime is 215530163. The next prime is 215530177. The reversal of 215530164 is 461035512.

It can be written as a sum of positive squares in 2 ways, for example, as 37307664 + 178222500 = 6108^2 + 13350^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215530163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38379 + ... + 43634.

Almost surely, 2^215530164 is an apocalyptic number.

It is an amenable number.

215530164 is an abundant number, since it is smaller than the sum of its proper divisors (336752112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215530164 is a wasteful number, since it uses less digits than its factorization.

215530164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82096 (or 82091 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 215530164 is about 14680.9456098713. The cubic root of 215530164 is about 599.5646508616.

Adding to 215530164 its reverse (461035512), we get a palindrome (676565676).

The spelling of 215530164 in words is "two hundred fifteen million, five hundred thirty thousand, one hundred sixty-four".